Expansible mandrel.



- space betweenv the confronting longitudinal raros.

Arent CARL e. NAYLon, or cHmAGaiLLINoIs.

ExrANsiBLE MANDREL.'

To all whom, t may] concern? Beit known that I, CARL lzen of .the United States,residing at Ghicago, in the county of Cook and yState of Illinois, have invented certain new and use- `t'nl Improvements in Expansible Mandrels,A

of whiclrt'he following is al specification.

f Hy invention relates to improvements in .expanding 'mandrels One ot' the objects ot' my invention is to provide an improved Vexpanding mandrel having two, normally substantially concentric members, a driving and al driven member, the latter being automatically expansible by the effect o t' relative rotary displacement of the members` due' to the torquerequired to overcome the'd'riving lag of thedriven member, when the said members are rotated in a given direction, and which automatically contracts its diametric dimension upon cessation of the torque effect, and Will not be expanded when rotated in the opposite direction.

A'notherand more specific object of .my invention is to provide a driving member and a surrounding diametrically-expansible longitudinally-split sleeve, and means in a edges of the sleeve, produced by the cleavage,I

movable .by thedriven member, for separating'said edges to increase the effective diameter of the sleeve.

In vthe illustrative' embodiment of my in vention, I have shown in thedrawings a series of mandrel sections comprising co1' lectively, a composite mandrel, each Section .being adapted tof be expanded to a'definite predetermined extent or to .a degree limited only bythe functional operation of the expanding means.

In the drawings ll `igure Alslnows a tion of the compositemandrel. Figi 2 is an enlarged plan view of -a frag-v ment of two ends ot adjacent sections look;

ing on a portion inthe direction of the a1' rows, indicated by the line 2-2 of Fig. 1.

, 4--4 of Fig. 1.v

Fig. 3 isa transverse section taken on line a-a of Fig. 1. I f

, Fig. 4 isa similar section takentn line Fig.'5 ris a similar section taken on line In all the views the same reference characters are employed to indicate similar parts.

Specification of Letters Patent.

G. NAYLOR, a citilongitudinal central secterbored, as shown at 15, to receive a ring 16 that'is rotatably loose upon the shaft 5. The sleeve 13is thicker at its mid-portion, as 'at 17, and gradually decreases in thickness up.

to the cleavage edges 14,' as shown by thedot` ted lines 15B. The object of tapering the Patented Mar. d, 19N?, Appngaqnaieamyas,191s. seiiainaeaam.

sleeve -from thepoint 17-to a'diametrically opposite partis 'to cause it to expand more pmformly throughout its circumferential exent. t

'l/he shaft 5 is provided with a loneitudinal y extending/outwardly projecting 18 eoextensive' withthel length ofthe composite mandrel.l tweenabutting end 1 and 22 of each of the sleeves al d when the respectivedriven sieeve membe 13 of the vma'ndrelsection is con tracted to its 'maximum extent the plate 20 is brought into radial position, with one 'edge against the feather 18 in the shaft 5, as shown in Fig. 5.' Nowwhen the shaft is -tnrned i the direction of the arrow 23,

shown in ig.-3, Ythe feather 18 Willadvance ahead of the driven member 13, ,and thereby l,plate 20 is placed be- FSC# carry the lower end of the plate forwar This rotary displacement o the driving member with respect to rthe driven member 13, will cause the plate l2O to wedge apart, or further separate 'the confronting longitudinal edges 21 and 22 of the sleeve,

thus increasing the diameter of the sleeve,

.The extent to which/the driven member` 13 may be expanded may be limited, when desired, by the stop pins 25 and 26 in 'the ends of the expansihle drivenfmembers13,'respec- Fig. 3 shows the pinsplaced radially in the ring 1G angl projecting into the slots`27 and 28, of the tplit sleeve 13, of the mandrel. Figs. 4 and 5 are shownto be not provided withstop pins 25 and 26, therefore; the sec tions 8, 9 and 10 may be expanded to am7 extent Within. the capability of the device when unprovided with saidmeans for limiting the expansion, as shown'.

The rings 16 are; pinned, or otherwise securedto the sleeve 13, as at 30. Thel rings 16 are a-lso slotted, as at 19. The feather 18 passes through all of the slots 19 in all of the rings. The slots are sutiiciently extensive ice l to permit the feather to have enough free numbered 179,657, filed. J uly .10th, 1917i and' inwhi-eh a somewhat dilfe'rent forih of man- 'drel is illustrated and described.-

It will be observed that the relative rotary displacement of the members 5 and 13, as a result of the torque stress transmitted through said members, is thel indirect means by which expansion of the mandrel is effected, and that when the stress is no longer transmitted through the membeis, the mandrel will automatically contract itselt` and bring the expanding plates back into radial line, as shown more clearly in Fig. 5.

While I have herein shown a single embodiment of my invention fo;4 the purpose of clear disclosure it is manifest to persons skilled in the art that changes i'iiaybe made in the general configuration and arrangement. of the parts within the purview of the appended claims. y

Having described my invention, what I .claim is z- L'An expansible mandrel comprising a driving shait member; adriven, longitudinally spllt sleeve member thereon and means' within the seliarated edges of the sleeve for enlargingthe cleavage to expand the sleeve,` automatieally operable bythe rotaryudisplacement ot the driv-ing and driven memis especially adapted for tljf 3. .An eXpa-nsible mandrel y comprising a driving shaft member; a driven, long1tud1- nally split sleeve member thereon, means between the separated edges yof the sleeve for enlarging the cleavage to expand the sleeve, operable by the relative rotary displacement of the' sleeve, and mea-ns tofpositively limit the extent of expansion of said sleeve.

4. A composite mandrel comprising a series of`transversely separated mandrel sections, each section provided with anexpansible sleeve; a shaft upon which said sleeves are mounted; means automatically operable by the relative rotary displacement of said sha-ft and sleeves to expand the sleeves.

5. An composite mandrel comprising a series, of transversely separated independently expansible mandrel sections, each section. provided with an expansible sleeve; a

.shaft upon which said sleeves are mounted;

f and driven men'ibers and stops to positively limit the extent of expansion ot' selected mandrel sections.

7. A mandrelcomprising a shaft; a feather extending longitudinally thereof; a split sleeve on lsaid shaft, encompassing the feather; a radially disposed plate between the separated edges of the sleeve adapted to have its base rotatably displaced by said feather to expand the sleeve when the shaft is rotated.'

Intestnnoi'ly whereof I hereunto subscribe my name.

CARL o. Navigon. 

